New benzene phosphonous acid compounds, their production and use as stabilizers for organic materials

Abstract

The purpose of the invention are new benzene phosphonous acid compounds in which two to four benzene nuclei are bound together and which contain one to three phosphorus atoms. The new compounds are free acids, their salts with inorganic cations, their esters, thioesters or amides. The invention concerns also the manufacture of these benzene phosphonous acid compounds and their use for the stabilization of organic materials.

What is claimed is: 
     
       1. A compound of the formula ##SPC14## wherein   Y is oxygen or sulphur and   n is 1 or 2, or the sodium, potassium, barium or calcium salt thereof.     
     
     
       2. A compound of the formula defined in claim 1 which is the barium or calcium salt thereof. 
     
     
       3. A compound according to claim 1 of the formula ##SPC15## 
     
     
       4. A compound of claim 1, of the formula ##SPC16## wherein n is 1 or 2.   
     
     
       5. A compound of claim 4, wherein n is 1. 
     
     
       6. A compound of claim 5, of the formula ##SPC17##